Log Message:
Update net/rabbitmq-c to 0.5.0. Add bl3.

- Add amqp_get_broker_properties() function
- Remove distro-specific packaging
- Add -x flag to amqp-consume utility
- Add amqp_basic_nack() public API
- Add delivery mode constants to amqp.h
- Add support for connection.blocked/connection.unblocked methods
- Examples: Destroy amqp_envelope_t in consumer example
- CMake: fix generation of librabbitmq.pc
- CMake: fix missing POPT_INCLUDE_DIRS variable in tools/
- build: provide independent locations for x64 libs
- Doc: documentation fixes
- Lib: Correct OpenSSL initialization under threaded conditions
- Examples: Handle unexpected frames in amqp_consumer.c
- CMake: Use GnuInstallDirs to generate install dirs
- Lib: correctly handle amqp_get_monotonic_timestamp on win32
- Tools: honor --persistent flag in publish utility
- Doc: improve documentation in amqp_ssl_socket functions
- autoconf: correct librabbitmq.pc generation
- Doc: improve documentation in amqp_tcp_socket functions